Lightweight actor library built on asyncio primitives (~800 lines):
- Actor base class with lifecycle hooks (on_started/on_stopped/on_restart)
- ActorRef with tell (fire-and-forget) and ask (request-response)
- Supervision: OneForOne/AllForOne strategies with restart limits
- Middleware pipeline for cross-cutting concerns
- Pluggable Mailbox interface (MemoryMailbox default, RedisMailbox optional)
- ReplyRegistry + ReplyChannel: ask() works across any mailbox backend
- System-level thread pool for blocking I/O (run_in_executor)
- Dead letter handling, poison message quarantine, parallel shutdown
- 22 tests + benchmark suite
greatmengqi